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CVE-2021-47323— watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于内存释放后重用。

AI Predicted 3.3 Difficulty: Hard EPSS 1.16% · P67

Possible ATT&CK Techniques 1 AI

T1112 · Modify Registry

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b4565a8a2d6bffb05bfbec11399d261ec16fe373 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2aef07017fae21c3d8acea9656b10e3b9c0f1e04 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 522e75ed63f67e815d4ec0deace67df22d9ce78e affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7c56c5508dc20a6b133bc669fc34327a6711c24c affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f0feab82f6a0323f54d85e8b512a2be64f83648a affected
… +12 more rows
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I. Basic Information for CVE-2021-47323

Vulnerability Information
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Vulnerability Title
watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于内存释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2021-47323

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III. Intelligence Information for CVE-2021-47323

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Patches & Fixes for CVE-2021-47323 (2)

Other References for CVE-2021-47323 (7)

Same Patch Batch · Linux · 2024-05-21 · 361 CVEs total

CVE-2023-52732 9.8 CRITICAL ceph: blocklist the kclient when receiving corrupted snap trace
CVE-2023-52755 9.8 CRITICAL ksmbd: fix slab out of bounds write in smb_inherit_dacl()
CVE-2021-47328 9.8 CRITICAL scsi: iscsi: Fix conn use after free during resets
CVE-2023-52741 9.8 CRITICAL cifs: Fix use-after-free in rdata->read_into_pages()
CVE-2021-47378 9.8 CRITICAL nvme-rdma: destroy cm id before destroy qp to avoid use after free
CVE-2021-47232 9.8 CRITICAL can: j1939: fix Use-after-Free, hold skb ref while in use
CVE-2021-47427 9.8 CRITICAL scsi: iscsi: Fix iscsi_task use after free
CVE-2023-52846 8.8 HIGH hsr: Prevent use after free in prp_create_tagged_frame()
CVE-2023-52801 8.8 HIGH iommufd: Fix missing update of domains_itree after splitting iopt_area
CVE-2023-52798 8.8 HIGH wifi: ath11k: fix dfs radar event locking
CVE-2021-47388 8.8 HIGH mac80211: fix use-after-free in CCMP/GCMP RX
CVE-2021-47390 8.8 HIGH KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect()
CVE-2023-52790 8.8 HIGH swiotlb: fix out-of-bounds TLB allocations with CONFIG_SWIOTLB_DYNAMIC
CVE-2023-52769 8.8 HIGH wifi: ath12k: fix htt mlo-offset event locking
CVE-2023-52776 8.8 HIGH wifi: ath12k: fix dfs-radar and temperature event locking
CVE-2021-47308 8.8 HIGH scsi: libfc: Fix array index out of bound exception
CVE-2023-52829 8.4 HIGH wifi: ath12k: fix possible out-of-bound write in ath12k_wmi_ext_hal_reg_caps()
CVE-2021-47240 8.4 HIGH net: qrtr: fix OOB Read in qrtr_endpoint_post
CVE-2021-47352 8.4 HIGH virtio-net: Add validation for used length
CVE-2021-47244 8.2 HIGH mptcp: Fix out of bounds when parsing TCP options

Showing top 20 of 361 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47323

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